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babel-plugin-transform-es2015-classes
Advanced tools
Readme
Compile ES2015 classes to ES5
Built-in classes such as Date
, Array
, DOM
etc cannot be properly subclassed
due to limitations in ES5 (for the es2015-classes plugin).
You can try to use babel-plugin-transform-builtin-extend based on Object.setPrototypeOf
and Reflect.construct
, but it also has some limitations.
In
class Test {
constructor(name) {
this.name = name;
}
logger () {
console.log("Hello", this.name);
}
}
Out
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
var Test = function () {
function Test(name) {
_classCallCheck(this, Test);
this.name = name;
}
Test.prototype.logger = function logger() {
console.log("Hello", this.name);
};
return Test;
}();
npm install --save-dev babel-plugin-transform-es2015-classes
.babelrc
(Recommended).babelrc
// without options
{
"plugins": ["transform-es2015-classes"]
}
// with options
{
"plugins": [
["transform-es2015-classes", {
"loose": true
}]
]
}
babel --plugins transform-es2015-classes script.js
require("babel-core").transform("code", {
plugins: ["transform-es2015-classes"]
});
loose
boolean
, defaults to false
.
Please note that in loose mode class methods are enumerable. This is not in line with the spec and you may run into issues.
Under loose mode, methods are defined on the class prototype with simple assignments instead of being defined. This can result in the following not working:
class Foo {
set bar() {
throw new Error("foo!");
}
}
class Bar extends Foo {
bar() {
// will throw an error when this method is defined
}
}
When Bar.prototype.foo
is defined it triggers the setter on Foo
. This is a
case that is very unlikely to appear in production code however it's something
to keep in mind.
FAQs
Compile ES2015 classes to ES5
The npm package babel-plugin-transform-es2015-classes receives a total of 1,090,802 weekly downloads. As such, babel-plugin-transform-es2015-classes popularity was classified as popular.
We found that babel-plugin-transform-es2015-classes demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
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